KR102466202B1 - Method and apparatus for requesting uplink persistent scheduling in mobile communication systems - Google Patents

Abstract

A method and apparatus for requesting uplink continuous allocation in a mobile communication system are provided. After the UE configures Semi-Persistent Scheduling (SPS) with the base station, it generates an SPS Buffer Status Report (BSR) that includes a data size and further includes at least one of an SPS transmission time point and an SPS period, and sends the SPS BSR to the base station. SPS assignment is requested while transmitting to . The data size indicates the size of data to be transmitted per SPS period.

Description

Method and apparatus for requesting uplink persistent scheduling in mobile communication systems

The present invention relates to a method and apparatus for requesting an uplink continuous allocation in a mobile communication system.

Existing mobile communication, for example, LTE (long term evolution) mobile communication system, for periodic real-time service such as VoIP in uplink, periodic uplink without an increase in overhead due to transmission of a control channel for every packet transmission. Provides Semi-Persistent Scheduling (SPS) for link resource allocation. Uplink SPS configuration is performed by a Radio Resource Control (RRC) reconfiguration process, and in this process, an SPS period is set. The uplink SPS allocation request is made by transmitting a BSR (Buffer Status Report) subheader through a SR (Scheduling Request) PUCCH (Physical Uplink Control CHannel) or RA (Random Access) process, and the BSR is waiting in the UE's buffer. Include data size. SPS activation or allocation is performed by Physical Downlink Control CHannel (PDCCH), and SPS allocation information includes SPS resource size, Modulation Coding Scheme (MCS), and the like.

However, in real-time services that are sensitive to delay in current and future mobile communication services, the traffic generation cycle may vary over time, and the size of traffic data generated for each cycle may also vary. In order to change the SPS transmission period in the existing LTE SPS scheme, the RRC reconfiguration process must be performed again. In addition, for low-latency transmission, the arrival time of the data packet and the SPS transmission time must be allocated as close as possible. There is no means. In addition, the existing BSR indicates the total size of data currently waiting in the terminal buffer, and does not mean the size of data to be transmitted per SPS transmission period.

Therefore, a method for low-delay and efficient SPS in uplink is required.

An object to be solved by the present invention is to provide a method and apparatus for requesting continuous uplink allocation by a terminal for low-latency and efficient SPS in uplink of a mobile communication system.

In the method according to the embodiment of the present invention, in the method of requesting uplink continuous allocation, after the UE configures Semi-Persistent Scheduling (SPS) with the base station, the data size is included, and at least among the SPS transmission time and the SPS period Generating an SPS BSR (Buffer Status Report) including one more; and requesting SPS allocation while the terminal transmits the SPS BSR to the base station, wherein the data size indicates the size of data to be transmitted per SPS period.

In the requesting step, the SPS BSR is transmitted using a medium access control (MAC) packet data unit (PDU), and a subheader of the MAC PDU includes an SPS BSR MAC control element as a payload It may include a logical channel ID (LCID) set in a predetermined sequence to inform that it is included as .

The SPS BSR MAC control element includes a logical channel group (LCG) ID, a start field including information corresponding to the SPS transmission time point, a period field including a subframe unit corresponding to the SPS period, and an SPS data size. May contain a size field.

Alternatively, the SPS BSR MAC control element includes a start field including information corresponding to the SPS transmission time point, a period field including subframe units corresponding to the SPS period, a size field including SPS data size, and SPS allocation. It may include an LCID, which is an ID of a logical channel to be transmitted through.

The start field includes information related to a subframe number corresponding to a transmission time requested as an SPS transmission time, and the information may include a lower LSB (Least Significant Bit) when the subframe number is expressed as a bit string. can When the UE requests the SPS period (P), SPS transmission time point (T), and SPS data size (S) through the SPS BSR, the subframe number is "Subframe number LSB = (T modulo P) + nP (n = 0, 1, 2, …)" can be satisfied.

On the other hand, the method, prior to the generating step, according to the SPS configuration from the base station, receiving a RRC (Radio Resource Control) reconfiguration message including a plurality of usable SPS cycles; Transmitting an RRC reconfiguration complete message in response to the RRC reconfiguration message; and transmitting an uplink SPS request to the base station for data transmission by the SPS in uplink. The SPS period included in the SPS BSR may be one of a plurality of SPS periods included in the RRC reconfiguration message.

The method may further include, after the requesting step, receiving SPS activation information according to SPS allocation based on the SPS BSR from the base station; and performing SPS transmission by the terminal according to the SPS activation information, wherein the SPS activation information includes an SPS period, and the SPS period includes an SPS BSR transmitted by the terminal. It may be set based on.

Here, when the SPS transmission time included in the SPS BSR transmitted by the terminal is subframe T, the SPS activation in subframe TN _proc so that resource allocation according to the SPS is made in subframe T according to the SPS transmission time information can be transmitted.

The method may further include, after the transmitting of the SPS, requesting a change in the size of the allocated resource or the SPS cycle by transmitting a new SPS BSR.

An apparatus according to another embodiment of the present invention, in an apparatus for requesting an uplink sustained allocation of a terminal, a transceiver for transmitting and receiving a signal through an antenna, connected to the transceiver, and performing an uplink sustained allocation request process. A processor comprising: an SPS request processing unit configured to transmit an uplink SPS request to the base station after Semi-Persistent Scheduling (SPS) configuration; and a size of data to be transmitted for each SPS cycle, generating an SPS Buffer Status Report (BSR) including at least one of an SPS transmission time point and an SPS cycle, and requesting SPS allocation while transmitting the SPS BSR to the base station. and a BSR report processing unit configured to do so.

The BSR report processing unit may be configured to generate the SPS BSR by selecting one of a plurality of available SPS periods included in the reconfiguration message received from the base station.

The processor may include: an SPS reception processing unit configured to receive SPS activation information according to SPS allocation based on the SPS BSR from the base station; and a transmission processing unit configured to allow the terminal to perform SPS transmission according to the SPS activation information, wherein the transmission processing unit may be configured to transmit data according to an SPS period included in the SPS activation information.

The report processing unit transmits the SPS BSR using a medium access control (MAC) packet data unit (PDU), and a subheader of the MAC PDU includes an SPS BSR MAC control element as a payload. It may include a logical channel ID (LCID) set in a predetermined sequence to notify the inclusion.

The SPS BSR MAC control element includes a logical channel group (LCG) ID, a start field including information related to a subframe number corresponding to a transmission time point requested as the SPS transmission time point, and a subframe unit corresponding to the SPS period. It may include a period field that includes a period field and a size field that includes the size of the SPS data.

Alternatively, the SPS BSR MAC control element includes a start field including information related to a subframe number corresponding to a requested transmission time point as the SPS transmission time point, a period field including a subframe unit corresponding to the SPS period, and SPS data. It may include a size field including a size and an LCID that is an ID of a logical channel to be transmitted through SPS allocation.

A base station according to another embodiment of the present invention is connected to a transceiver for transmitting and receiving a signal through an antenna in a base station that processes a request for uplink continuous allocation of a terminal, and is connected to the transceiver, and responds to a continuous uplink allocation request. and a processor that performs RRC reconfiguration process with the terminal to configure Semi-Persistent Scheduling (SPS), and transmits an RRC reconfiguration message including a plurality of usable SPS cycles to the transceiver. SPS configuration processing unit configured to transmit to a terminal through; an SPS allocation processor receiving an SPS Buffer Status Report (BSR) transmitted from the terminal through the transceiver and performing SPS allocation processing based on the SPS BSR; and an information transmission processing unit for transmitting SPS activation information according to allocation processing of the SPS allocation processing unit to the terminal through the transmitting and receiving unit, wherein the SPS activation information includes an SPS period.

The SPS BSR may include a size of data to be transmitted for each SPS cycle, an SPS transmission time point, and an SPS cycle, and the SPS allocation processing unit transmits an SPS BSR MAC transmitted through a medium access control (MAC) packet data unit (PDU). The SPS BSR is obtained from a control element, and based on a logical channel ID (LCID) included in a subheader of the MAC PDU, it can be recognized that the payload of the MAC PDU includes the SPS BSR MAC control element. have.

The information transmission processing unit, when the SPS transmission time included in the SPS BSR received from the terminal is subframe T, subframe TN _proc so that resource allocation according to the SPS is made in subframe T according to the SPS transmission time In the SPS activation information can be transmitted.

According to an embodiment of the present invention, for efficient SPS, the UE may request persistent allocation, that is, SPS, while transmitting SPS transmission time, SPS period, and SPS data size to the base station. Therefore, in the uplink of the mobile communication system, transmission delay time of the persistent allocation method can be reduced, and variable real-time traffic can be serviced more efficiently.

1 is a diagram illustrating an SPS processing process in a mobile communication system according to an embodiment of the present invention.
2 is a diagram showing the structure of a subheader according to an embodiment of the present invention.
3 is an exemplary diagram showing the configuration of an SPS BSR MAC control element according to an embodiment of the present invention.
4 is an exemplary diagram showing the configuration of another SPS BSR MAC control element according to an embodiment of the present invention.
5 is a diagram illustrating a process of transmitting an uplink packet according to an uplink SPS method of an existing LTE system, and FIG. 6 illustrates a process of transmitting an uplink packet according to an uplink SPS method according to an embodiment of the present invention. It is an example shown.
7 is a structural diagram of an uplink sustained allocation request device according to an embodiment of the present invention.
8 is a structural diagram of a base station according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Throughout the specification, a terminal includes a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), and a high reliability mobile station (HR-MS). , subscriber station (SS), portable subscriber station (PSS), access terminal (AT), user equipment (UE), etc., and may refer to MT, MS, AMS , HR-MS, SS, PSS, AT, UE, etc. may include all or some functions.

In addition, a base station (BS) includes an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR)-BS, relay that serves as a base station station (RS), relay node (RN) that serves as a base station, advanced relay station (ARS) that serves as a base station, and high reliability relay station (HR) that serves as a base station -RS), small base station [femto base station (femoto BS), home node B (home node B, HNB), home eNodeB (HeNB), pico base station (pico BS), metro base station (metro BS), micro base station (micro BS ), etc.], and may include all or some functions of ABS, NodeB, eNodeB, AP, RAS, BTS, MMR-BS, RS, RN, ARS, HR-RS, small base station, etc. have.

Hereinafter, a method and apparatus for requesting continuous uplink allocation in a mobile communication system according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram illustrating a process of processing Semi-Persistent Scheduling (SPS) in a mobile communication system according to an embodiment of the present invention. Specifically, FIG. 1 shows processes of uplink SPS configuration, SPS activation, SPS transmission, and reallocation according to an embodiment of the present invention in a mobile communication system. Reallocation may also be referred to as SPS Changing.

In order to allocate an SPS to an arbitrary terminal, first, an RRC reconfiguration process between the base station and the terminal is performed to configure the SPS (SPS configuration). The base station transmits an RRC reconfiguration message (RRC Reconfiguration) including an SPS period, SPS C-RNTI (Cell-Radio Network Temporary Identifier), main SPS parameters, etc. to the terminal (S100). In an embodiment of the present invention, a plurality of usable SPS periods are included in the RRC reconfiguration message and transmitted. The terminal completes the SPS configuration by transmitting an RRC reconfiguration complete message in response to the RRC reconfiguration message (S110).

Conventionally, one SPS period for a corresponding terminal is determined and transmitted, whereas as shown in the attached FIG. 1, an SPS period set including a plurality of usable SPS periods is included in a reconfiguration message and transmitted. , a plurality of usable SPS cycles for an arbitrary terminal are provided through the SPS configuration process.

After the SPS configuration is completed, in order to transmit data by SPS in uplink, the terminal performs a process for requesting uplink SPS (SPS request). If there is a Physical Uplink Control CHannel (PUCCH) allocated to the UE for Scheduling Request (SR), the UE transmits the SR through the corresponding PUCCH (S120), and the base station receives a Physical Downlink Control CHannel (PDCCH) (uplink grant ( Through UL grant transmission), the terminal allocates uplink resources for transmitting a Buffer Status Report (BSR) (S130). The UE transmits the BSR through the Physical Uplink Shard CHannel (PUSCH) in the allocated uplink resources (S140). Here, the UE transmits an SPS BSR for requesting uplink SPS allocation.

The SPS BSR according to an embodiment of the present invention includes an SPS transmission time, an SPS period, and a data size requested for each period (hereinafter, referred to as SPS data size). Conventionally, a UE transmits a BSR including only size information of entire data waiting for uplink transmission. The previously transmitted data size does not mean the size of data to be transmitted per SPS period. However, in the embodiment of the present invention, the BSR including the SPS transmission time, SPS period, and SPS data size, that is, the SPS BSR is transmitted. Since the size of data to be transmitted per SPS period is provided instead of the size of the entire data currently waiting in the terminal buffer, the base station can perform more efficient SPS allocation. Here, the SPS period may be one period selected from among a plurality of usable SPS periods provided to the terminal by the base station in the above SPS configuration process. Meanwhile, when there is no PUCCH allocated to the UE for SR, the UE is allocated resources for transmitting the BSR through a random access (RA) process. In an embodiment of the present invention, transmission and reception of signals through channels such as PUCCH and PDCCH may be expressed as 'transmission and reception of channels such as PUCCH and PDCCH'.

After receiving the SPS BSR from the terminal, the base station performs SPS based on the SPS BSR, and transmits SPS activation information according to the SPS execution through the PDCCH to notify the terminal of radio resource allocation according to the SPS (S150).

In an embodiment of the present invention, when the SPS transmission time included in the SPS BSR transmitted by the UE is requested in subframe T, the base station transmits the PDCCH for SPS activation in subframe TN _proc , and the SPS transmission time requested by the UE According to this, resource allocation according to the SPS can be performed in subframe T. N _proc is an interval between a PDCCH reception subframe and a subframe to which uplink resource allocation included in the PDCCH is applied, as in the existing system, and is 4 in the case of an FDD system. In addition, for SPS allocation according to the SPS period and SPS data size included in the SPS BSR transmitted by the terminal, information related to radio resource allocation according to the SPS transmitted on the PDCCH (named SPS allocation information) is SPS resource location, It includes a transport block (TB) size and a modulation and coding scheme (MCS), and in particular, further includes an SPS period. Conventionally, the SPS period for the UE is determined during the SPS configuration process, but in the embodiment of the present invention, the SPS period is included in SPS activation information transmitted for SPS activation and transmitted through the PDCCH.

The terminal receives the PDCCH including the SPS allocation information, and periodically transmits packets through the PUSCH in the allocated SPS resources based on the PDCCH (SPS transmission) (S160 to S180). SPS transmission indicates that the UE periodically transmits packets in uplink according to allocated SPS resources.

Conventionally, if the SPS period is determined in the SPS configuration process based on RRC reconfiguration and the PDCCH including SPS activation information is received in subframe nN _proc , the starting point of SPS transmission in uplink of the existing LTE-based system is uplink subframe becomes n. In this case, the UE starts from uplink subframe n (the starting point of SPS transmission) to uplink subframes n, n+P, n+2P, . … transmits data periodically through PUSCH.

On the other hand, in an embodiment of the present invention, the PDCCH including SPS activation information is received in subframe TN _proc , and the UE performs SPS transmission in subframe T, which is the requested SPS transmission time point. The UE starts uplink subframes T, T+P, T+2P, . … transmits data periodically through PUSCH.

For low-latency transmission, the data packet arrival time when the data packet for uplink transmission arrives at the buffer of the terminal and the SPS transmission time when the packet is transmitted based on the SPS resource should be allocated as close as possible to each other, but in the past, the terminal The time difference between the data packet arrival time and the SPS transmission time cannot be informed to the base station. However, according to an embodiment of the present invention, the terminal transmits the SPS BSR including the SPS transmission time point set by the terminal to the base station, the base station activates the SPS based on the SPS transmission time point requested by the terminal, and the terminal transmits the corresponding SPS Transmits data packets at the point of transmission. Therefore, since the difference between the data packet arrival time and the SPS transmission time hardly occurs, low-latency transmission is achieved.

Meanwhile, the terminal may transmit an SPS BSR to the base station to request a change in the size of the allocated resource (S190). The base station may allocate a new SPS to replace the existing SPS allocation through the PDCCH in order to change the SPS resource size according to the SPS BSR. In this case, the base station transmits SPS release control information to release the existing SPS allocation through the PDCCH and transmits SPS activation information for new SPS allocation. The SPS activation information includes an SPS period (SPS activation information). / release) (S200, S210). When the transmission time of the new SPS assignment is the same as the transmission time of the existing SPS, only the PDCCH including SPS activation information is transmitted without SPS release (SPS overriding).

In addition, in order to request a change of the SPS period, the terminal may transmit an SPS BSR including a new SPS period to the base station as described above, and accordingly, the base station performs a new SPS allocation and includes the changed SPS period. SPS activation information may be transmitted to the terminal through the PDCCH. Conventionally, in order to change the SPS period in the uplink SPS method, the RRC reconfiguration process has to be performed again, but in the embodiment of the present invention, the SPS period can be changed more easily through SPS BSR transmission.

Thereafter, the UE periodically transmits data through the PUSCH according to the SPS resource of the changed size or the SPS period (S220 and S230).

As described above, in the embodiment of the present invention, the terminal transmits the SPS transmission time, SPS period, and SPS data size to the base station, and the base station performs SPS allocation and reallocation accordingly, thereby providing low-latency and efficient uplink. SPS operation takes place.

2 is a diagram showing the structure of a subheader according to an embodiment of the present invention.

The SPS BSR message is one of the MAC control elements (CE) performed in the medium access control (MAC) layer, and is distinguished from other control elements in the MAC layer by a logical channel ID (LCID).

As shown in FIG. 2, in order to notify transmission of an SPS BSR according to an embodiment of the present invention, a subheader (named a MAC subheader for convenience of description) included in a header of a MAC PDU (packet data unit) LCID contains a specific sequence. The LCID is set in a predetermined specific sequence to notify that the payload of the MAC PDU includes the SPS BSR MAC Control Element (CE). For example, as shown in FIG. 2, it is set to a specific sequence of LCID = 101101 to inform that the SPS BSR is transmitted through the corresponding PDU. In the MAC subheader shown in FIG. 2, "R" is a reserved bit field, and "E" is an extension field, which are the same fields as the existing LTE MAC subheader.

3 is an exemplary diagram showing the configuration of an SPS BSR MAC control element according to an embodiment of the present invention.

As illustrated in FIG. 3, the SPS BSR MAC Control Element includes an LCG ID, a Start field, a Period field, and a Size field.

The buffer status report performed by the UE is reported in logical channel group (LCG) units. The LCG may be determined by the base station in consideration of QCI (QoS class of identifier) corresponding to QoS (Quality of Service) information of each radio bearer (RB), and the LCG ID may be transmitted through SPS allocation. Indicates the LCG group to which the logical channel belongs.

The start field includes information related to the subframe number corresponding to the requested transmission time point as the SPS transmission time point (S), and specifically includes the lower LSB (Least Significant Bit) when the subframe number is expressed as a bit string. . For example, the start field includes lower 6 bits of a subframe number represented by a bit string.

The period field includes a subframe unit corresponding to the requested SPS period (P). The size field includes the size of data to be transmitted for each requested SPS period (P), and may indicate the data size in bytes.

4 is an exemplary diagram showing the configuration of another SPS BSR MAC control element according to an embodiment of the present invention.

Unlike the configuration of FIG. 3 , the SPS BSR MAC Control Element includes an LCID, a start field, a period field, and a size field as illustrated in FIG. 4 . That is, instead of the LCG ID, the LCID includes the ID (LCID) of the logical channel to be transmitted through SPS allocation.

When the UE requests the SPS period (P), SPS transmission time point (T), and SPS data size (S) through the SPS BSR, the subframe number is "Subframe number LSB = (T modulo P) + nP (n = 0 , 1, 2, ...)", this indicates that periodic transmission of the SPS is requested in the subframe of the corresponding number.

SPS BSR MAC control elements having the structures described above may be transmitted over several subslots in which uplink control information is bundled in subslot bundling.

A comparison of an SPS processing procedure based on an uplink continuous allocation request according to an embodiment of the present invention with the existing one is as follows.

5 is a diagram illustrating a process of transmitting an uplink packet according to an uplink SPS method of an existing LTE system, and FIG. 6 illustrates a process of transmitting an uplink packet according to an uplink SPS method according to an embodiment of the present invention. It is an example shown.

In the existing LTE system, as illustrated in FIG. 5, an uplink packet arrives at the time of the subframe index 1 of each frame (packet arrival period = 10) every period (P = 10), and is stored in the terminal's buffer. buffered If no resource is allocated for uplink, the terminal transmits a pre-allocated PUCCH to inform the base station of the SR. After PUCCH (SR) reception and scheduling processing, the base station allocates uplink resources for BSR transmission of the terminal through the PDCCH (N _proc =4 subframes in the example of FIG. 5). The terminal transmits the PUSCH including the BSR through the allocated uplink resources, and the base station notifies the terminal of radio resource allocation through the PDCCH including the SPS activation information based on the BSR. At this time, the SPS period becomes a preset period in the RRC reconfiguration process (period 10 subframe in FIG. 5), and the SPS transmission time is N _proc = 4 subframes from the subframe in which the PDCCH including the SPS activation information is transmitted. becomes The UE periodically transmits packets through the PUSCH in the allocated SPS resources. In the example of FIG. 5, SPS transmission is performed in a cycle of 10 subframes in subframe 9 of each frame. Assuming that a subframe of D _rx =2 (D _rx indicates the time required to receive and decode a packet) is required for the base station to receive the PUSCH and decode the packet, the packet transmission delay is 21 subframes in FIG. applicable Since the length of a subframe in LTE is 1 ms, the packet transmission delay time is 21 ms.

In FIG. 5, when the packet arrival period changes from P=10 to P'=5 from packet 5, the size of the data in the uplink buffer increases and the terminal includes the BSR along with the data packet in the PUSCH to notify it. send. In this case, the base station allocates a new SPS to increase the SPS resource size. In FIG. 5, since an SPS is newly allocated at a time point corresponding to an existing transmission time point, only SPS activation information is transmitted without releasing the SPS. Although the SPS resource size was doubled by SPS reallocation in order to transmit packets generated at a twice-reduced period, the reallocation process did not take time and only the resource size was increased without changing the SPS transmission period. After allocation, the packet transmission delay time is 21 subframes, the same as before or increased to 26 subframes.

Meanwhile, when an uplink packet is transmitted according to the uplink SPS method according to an embodiment of the present invention, referring to the attached FIG. 6, as in the example of the conventional method shown in FIG. 5, packets arrive from packet #5. When the period is changed from P=10 to P'=5 and the data size in the uplink buffer increases, the UE requests a change in SPS allocation through the SPS BSR. If the processing time for PUSCH transmission of the packet in the buffer is a subframe of D _tx =2 ((D _tx represents the time required for processing to transmit the packet), D _tx =2 from the time the packet arrives After the subframe of, the packet can be transmitted through the SPS PUSCH with the minimum waiting time. In Fig. 6, since the packet arrives at the buffer in subframe 2 and subframe 7 of each frame, the SPS transmission time T '= (2 +1+D _tx ) modulo P'= 4 or T'= (7+1+D _tx ) modulo P'= 0 (in FIG. 6, T'=0 is requested), and the SPS transmission period is P'= 5 It is a subframe, and the SPS BSR is transmitted with the SPS transmission size S' = 2 packets. According to the BSR transmitted from the terminal, the base station notifies the terminal of the new SPS activation through the PDCCH, and the existing SPS through the PDCCH When the UE transmits data packets through the PUSCH according to the newly allocated SPS allocation, the packet transmission delay time for the packet in the process of changing the SPS allocation is 22 subs compared to the existing LTE method of FIG. frame and 17 subframes In addition, for packets arriving after the change process is completed, the packet transmission delay time is greatly reduced to 7 subframes Finally, the reduced packet transmission delay time is the processing time in the transmission and reception process is the minimum packet transmission delay time including

Next, when the number of packets accumulated in the buffer decreases due to the transmission of packets of SPS transmission size S = 2 per subframe of period P = 5, the terminal transmits packets of SPS transmission size S = 1 per subframe of period P = 5. Since packets arriving by transmission can be transmitted, request reduction to SPS size S=1 through SPS BSR. Since the base station only needs to reduce the resource size without changing the transmission time and period, the base station can change the existing SPS allocation resource size only by activating the SPS without transmitting the SPS release through the PDCCH.

In FIG. 6, an example of controlling SPS allocation by transmitting an SPS BSR during SPS transmission is shown, but from the initial SPS allocation process, the terminal receives packets with SPS transmission time T=5, SPS transmission period P=10, and SPS transmission size S=1. , it is possible to minimize the transmission delay time by adjusting the SPS transmission time according to the arrival time of the packet.

7 is a structural diagram of an uplink sustained allocation request device according to an embodiment of the present invention.

As shown in FIG. 7, the uplink continuous allocation request device 1 according to an embodiment of the present invention includes a processor 11, a memory 12, and a transceiver 13. The processor 11 may be configured to implement the methods described above based on FIGS. 1 to 4 .

To this end, the processor 11 includes an SPS request processing unit 110, a BSR report processing unit 120, an SPS reception processing unit 130, and a transmission processing unit 140.

After the SPS configuration is completed, the SPS request processing unit 110 is configured to perform an uplink SPS request for data transmission by the SPS in uplink.

The BSR report processing unit 120 is configured to generate an SPS BSR including an SPS transmission time point, an SPS period, and an SPS data size, and transmits the SPS BSR to the base station through the transceiver unit 13. The BSR report processing unit 120 transmits the SPS BSR by including it in the MAC subheader, and may transmit the SPS BSR through the allocated uplink resources according to the request of the SPS request processing unit 110.

The SPS receiving processing unit 130 is configured to receive SPS activation information according to the SPS based on the SPS BSR from the base station. SPS activation information includes SPS allocation information, and SPS allocation information includes SPS resource location, TB size, MCS, SPS cycle, and the like.

The transmission processing unit 140 is configured to periodically transmit data in the allocated SPS resources based on the SPS allocation information.

The memory 12 is connected to the processor 11 and stores various information related to the operation of the processor 11 . The memory 12 may store instructions to be executed by the processor 11 or may temporarily store instructions loaded from a storage device (not shown). Processor 11 may execute instructions stored or loaded in memory 12 . The processor 11 and the memory 12 are connected to each other through a bus (not shown), and an input/output interface (not shown) may also be connected to the bus.

8 is a structural diagram of a base station according to an embodiment of the present invention.

As shown in FIG. 8, the base station 2 according to an embodiment of the present invention includes a processor 21, a memory 22, and a transceiver 23.

The processor 21 may be configured to implement the methods described above based on FIGS. 1 to 4 .

To this end, the processor 21 includes an SPS configuration processing unit 210, an SPS allocation processing unit 220, and an information transmission processing unit 230.

The SPS configuration processing unit 210 is configured to configure the SPS by performing an RRC reconfiguration process between the base station and the terminal. The SPS configuration processing unit 210 transmits an RRC reconfiguration message including a number of usable SPS periods, SPS C-RNTI (Cell-Radio Network Temporary Identifier), and main SPS parameters to the terminal through the transceiver unit 23.

The SPS allocation processing unit 220 is configured to receive an SPS BSR from the terminal in response to an SPS allocation request from the terminal, and perform SPS allocation based on the received SPS BSR.

The information transmission processing unit 230 is configured to transmit SPS activation information according to the SPS allocation processing of the SPS allocation processing unit 220 to the terminal. The information transmission processing unit 230 transmits radio resource allocation related information according to the SPS allocation process and SPS activation information including the SPS cycle to the terminal through the transceiver unit 23.

The memory 22 is connected to the processor 21 and stores various information related to the operation of the processor 21 . The memory 22 may store instructions to be executed by the processor 21 or load and temporarily store instructions from a storage device (not shown). Processor 21 may execute instructions stored or loaded in memory 22 . The processor 21 and the memory 22 are connected to each other through a bus (not shown), and an input/output interface (not shown) may also be connected to the bus.

Embodiments of the present invention are not implemented only through the devices and/or methods described above, and may be implemented through a program for realizing functions corresponding to the configuration of the embodiments of the present invention, a recording medium on which the program is recorded, and the like. Also, this implementation can be easily implemented by an expert in the art to which the present invention belongs based on the description of the above-described embodiment.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

Claims (20)

In the method for requesting uplink persistent allocation,
After configuring Semi-Persistent Scheduling (SPS) with the base station, the UE generates an SPS Buffer Status Report (BSR) including a data size and further including at least one of an SPS transmission time point and an SPS cycle; and
Requesting SPS allocation while the terminal transmits the SPS BSR to the base station
including,
The data size indicates the size of data to be transmitted per SPS period. According to claim 1,
The requesting step is
To inform that the SPS BSR is transmitted using a medium access control (MAC) packet data unit (PDU), and that a subheader of the MAC PDU includes an SPS BSR MAC control element as a payload A request method comprising a logical channel ID (LCID) set in a predetermined sequence. According to claim 2,
The SPS BSR MAC control element includes a logical channel group (LCG) ID, a start field including information corresponding to the SPS transmission time point, a period field including a subframe unit corresponding to the SPS period, and an SPS data size. A request method, including a size field. According to claim 2,
The SPS BSR MAC control element is transmitted through a start field including information corresponding to the SPS transmission time point, a period field including subframe units corresponding to the SPS period, a size field including SPS data size, and SPS allocation. A request method, including the LCID, which is the ID of the logical channel to be requested. According to claim 3 or 4,
The start field includes information related to a subframe number corresponding to a transmission time point requested as an SPS transmission time point, and the information includes a lower LSB (Least Significant Bit) when the subframe number is expressed as a bit string , the request method. According to claim 5,
When the UE requests the SPS period (P), SPS transmission time point (T), and SPS data size (S) through the SPS BSR, the subframe number is "Subframe number LSB = (T modulo P) + nP (n = 0, 1, 2, …)", a request method. According to claim 1,
prior to the creation of
Receiving a Radio Resource Control (RRC) reconfiguration message including a plurality of usable SPS periods according to an SPS configuration from the base station;
Transmitting an RRC reconfiguration complete message in response to the RRC reconfiguration message; and
Transmitting an uplink SPS request to the base station for data transmission by SPS in uplink
Further comprising a request method. According to claim 7,
The SPS period included in the SPS BSR is one of a plurality of SPS periods included in the RRC reconfiguration message. According to claim 1,
After the requesting step,
receiving SPS activation information according to SPS allocation based on the SPS BSR from the base station; and
Performing, by the terminal, SPS transmission according to the SPS activation information
Including,
The SPS activation information includes an SPS period, and the SPS period is set based on an SPS period included in an SPS BSR transmitted by the terminal. According to claim 9,
When the SPS transmission time included in the SPS BSR transmitted by the terminal is subframe T, the SPS activation information in subframe TN _proc so that resource allocation according to the SPS is made in subframe T according to the SPS transmission time How the request is sent. According to claim 9,
After performing the SPS transmission,
Requesting, by the terminal, to change the size of the allocated resource or the SPS cycle by transmitting a new SPS BSR
Further comprising a request method. In the device requesting the continuous uplink allocation of the terminal,
A transceiver for transmitting and receiving signals through an antenna, and
A processor connected to the transceiver and performing an uplink sustained allocation request process;
the processor,
an SPS request processing unit configured to transmit an uplink SPS request to the base station after Semi-Persistent Scheduling (SPS) configuration; and
To generate an SPS Buffer Status Report (BSR) including the size of data to be transmitted for each SPS cycle and further including at least one of an SPS transmission time point and an SPS cycle, and requesting SPS allocation while transmitting the SPS BSR to the base station Configured BSR reporting processing unit
A requesting device comprising a. According to claim 12,
Wherein the BSR report processing unit is configured to generate the SPS BSR by selecting one of a plurality of available SPS periods included in a reconfiguration message received from the base station. According to claim 12,
the processor,
an SPS reception processing unit configured to receive SPS activation information according to SPS allocation based on the SPS BSR from the base station; and
Transmission processing unit configured to allow the terminal to perform SPS transmission according to the SPS activation information
Including more,
wherein the transmission processing unit is configured to transmit data according to an SPS period included in the SPS activation information. According to claim 12,
The report processing unit transmits the SPS BSR using a medium access control (MAC) packet data unit (PDU), and a subheader of the MAC PDU includes an SPS BSR MAC control element as a payload. A request device comprising a logical channel ID (LCID) set in a predetermined sequence to indicate that it contains. According to claim 15,
The SPS BSR MAC control element includes a logical channel group (LCG) ID, a start field including information related to a subframe number corresponding to a transmission time point requested as the SPS transmission time point, and a subframe unit corresponding to the SPS period. a period field containing the size of the SPS data; and a size field containing the size of the SPS data. According to claim 15,
The SPS BSR MAC control element includes a start field including information related to a subframe number corresponding to a requested transmission time point as the SPS transmission time point, a period field including a subframe unit corresponding to the SPS period, and an SPS data size. A size field containing, the requesting device including the LCID, which is the ID of the logical channel to be transmitted through the SPS allocation. In a base station processing a request for uplink continuous allocation of a terminal,
A transceiver for transmitting and receiving signals through an antenna, and
A processor connected to the transceiver and processing an uplink sustained allocation request;
the processor,
An SPS configuration processing unit configured to configure Semi-Persistent Scheduling (SPS) by performing an RRC reconfiguration process with the UE and transmit an RRC reconfiguration message including a plurality of usable SPS cycles to the UE through the transceiver;
an SPS allocation processor receiving an SPS Buffer Status Report (BSR) transmitted from the terminal through the transceiver and performing SPS allocation processing based on the SPS BSR;
Information transmission processing unit for transmitting SPS activation information according to the allocation processing of the SPS allocation processing unit to the terminal through the transmitting and receiving unit
Including,
The SPS activation information includes an SPS period. According to claim 18,
The SPS BSR includes the size of data to be transmitted for each SPS cycle, the SPS transmission time, and the SPS cycle,
The SPS allocation processor obtains the SPS BSR from an SPS BSR MAC control element transmitted through a medium access control (MAC) packet data unit (PDU), and an LCID included in a subheader of the MAC PDU ( base station recognizing that the payload of the MAC PDU includes the SPS BSR MAC control element based on the logical channel ID). According to claim 19,
The information transmission processing unit, when the SPS transmission time included in the SPS BSR received from the terminal is subframe T, subframe TN _proc so that resource allocation according to the SPS is made in subframe T according to the SPS transmission time Transmitting the SPS activation information from, the base station.

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